TUSB8044AI datasheet(3/69 Pages) TI1

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TUSB8044A

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SLLSF92A – FEBRUARY 2019 – REVISED MARCH 2019

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5 Description (continued)

When the upstream port is connected to an electrical environment that only supports full-speed/low-speed

connections, SuperSpeed USB and high-speed connectivity are disabled on the downstream ports.

The TUSB8044A supports per port or ganged power switching and over-current protection, and supports battery

charging applications.

An individually port power controlled hub switches power on or off to each downstream port as requested by the

USB host. Also when an individually port power controlled hub senses an over-current event, only power to the

affected downstream port will be switched off.

A ganged hub switches on power to all its downstream ports when power is required to be on for any port. The

power to the downstream ports is not switched off unless all ports are in a state that allows power to be removed.

Also when a ganged hub senses an over-current event, power to all downstream ports will be switched off.

The TUSB8044A downstream ports provide support for battery charging applications by providing Battery

Charging Downstream Port (CDP) handshaking support. It also supports a Dedicated Charging Port (DCP) mode

when the upstream port is not connected. The DCP mode supports USB devices which support with the USB

Battery Charging, Galaxy Charging, and Chinese Telecommunications Industry Standard YD/T 1591-2009. In

addition when upstream port is unconnected, the TUSB8044A supports the divider charging port modes (ACPx

modes) and an automatic transition through all modes, starting with ACP3 and ending in DCP.

Integrated in the TUSB8044A is a USB2.0 Billboard device which complies to the "USB Device Class Definition

for Billboard Devices Version 1.21" specification. The billboard device is attached to the highest number

downstream port of the TUSB8044A USB 2.0 hub. The purpose of the billboard is to communicate Alternate

Mode status to the host system. The TUSB8044A supports only one Alternate mode.

The TUSB8044A provides pin strap configuration for some features including battery charging support, and also

provides customization though OTP ROM, I2C EEPROM, or via an I2C/SMBus slave interface for PID, VID, and

custom port and phy configurations. Custom string support is also available when using an I2C EEPROM or the

I2C/SMBus slave interface.

The TUSB8044A supports programming of an attached EEPROM through its internal USB HID to I2C interface.

The device is available in a 64-pin RGC package and is offered in a commercial version (TUSB8044A) for

operation over the temperature range of 0°C to 70°C, and in an industrial version (TUSB8044AI) for operation

over the temperature range of –40°C to 85°C.

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